1640026843 has 16 divisors (see below), whose sum is σ = 2026967040. Its totient is φ = 1292157216.

The previous prime is 1640026823. The next prime is 1640026847. The reversal of 1640026843 is 3486200461.

It is not a de Polignac number, because 1640026843 - 2¹³ = 1640018651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640026799 and 1640026808.

It is not an unprimeable number, because it can be changed into a prime (1640026847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15955 + ... + 59452.

It is an arithmetic number, because the mean of its divisors is an integer number (126685440).

Almost surely, 2^1640026843 is an apocalyptic number.

1640026843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1640026843 is a deficient number, since it is larger than the sum of its proper divisors (386940197).

1640026843 is a wasteful number, since it uses less digits than its factorization.

1640026843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75666.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 1640026843 is about 40497.2448815966. The cubic root of 1640026843 is about 1179.2801419517.

The spelling of 1640026843 in words is "one billion, six hundred forty million, twenty-six thousand, eight hundred forty-three".